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Fair Value Measurement and Financial Instruments - Schedule of Carrying Amounts and Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Carrying Amount | Convertible preferred sock warrant liability |  |
Liabilities |  |
Total liabilities |  | $ 478
Fair Value | Convertible preferred sock warrant liability |  |
Liabilities |  |
Total liabilities |  | 478
Money market funds | Carrying Amount |  |
Assets |  |
Total assets | $ 86,605 | 11,149
Money market funds | Fair Value |  |
Assets |  |
Total assets | 86,605 | 11,149
Quoted Prices In Active Markets (Level 1) | Money market funds |  |
Assets |  |
Total assets | $ 86,605 | 11,149
Significant Unobservable Inputs (Level 3) | Convertible preferred sock warrant liability |  |
Liabilities |  |
Total liabilities |  | $ 478

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